You can easily get to the lower parts by jumping down
(jumping down 4 levels will only give you 10 damage)
You can also easily get back up by jumping over the
edge of the map. This will not kill you but teleport
you inmediately to the light at the top of the map
(Same goes for any prop thats tossed into the void)
In time theyll all fall back to the map from the sky
Happy fraggin!